= (x+y)^2 + 7(x+y) + 10
=(x+y)(x+y+7)+10
Hem phải thầy nhưng làm cho nè
\(x^2+2xy+y^2+7x+7y+10\)
\(=\left(x+y\right)^2+7\left(x+y\right)+10\)
\(=\left(x+y\right)\left(x+y+7\right)+10\)
x2 + 2xy + y2 + 7x + 7y + 10
= (x2 + xy + 5x) + (y2 + xy + 5y) + (2x + 2y + 10)
= x(x + y + 5) + y(y + x + 5) + 2(x + y + 5)
= (x + y + 2)(x + y + 5)